Peltor Tactical Sound-Trap Electronic Ear Muffs- Impulsive noise is immediately attenuated. Assisted by an "electronic vent," the hearing protector is designed to reduce hazardous impulse noise from firearms to harmless levels within 5 milliseconds. This minimises the chance that dangerous noise reaches the ear. To further improve communication possibilites, the SoundTrap is equipped with an electrical audio input jack for connection with two-way radios, telephones, mp3 players and iPods.